Fairleigh s



F. S. DICKINSON.

VALVELESS SYRINGE.

"APPLICATION FILED FEB. 20, 1919' 1 07,245. Patented June 17, 1919.-

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VALVELESS SYRINGE.

spe m m of Letters men Patented June 17,1919.

Application filed February 20, 1919. Serial No. 278,137.

T 0 all whom it may concern: 1 it Be it known thatI, FAlRLElGH' S. Dickin- SON, aficitizen of the United States, and a resident of Rutherford, in the-county of Bergen and State ofNew Jersey, have in vented a new andli'nproved Valveless Syringe, of which the following is a full, clear, andeXact description.

The invention relates to syringes having a barrel and a compressible bulb for drawing a medicated liquid into the barrel and subsequently ejecting it therefrom to an a 'lictcd part. The object of the invention is to provide a new and improved valveless syringe arranged to permit the userto readily draw the liquid into the barrel and to prevent the liquid from passing into the rubber bulb on holding the syringe with its nozzle upward and with the liquid resting on the: normally closed entrance to thebulb. Another object is to providea valveless syringe which is exceedingly simple in construction and not liable to get easily out of order, at the'same time permittingaquick and thorough sterilizing of the few parts forming the syringe. WVith these and other objects in view the invention consists ofcertain novel features of construction as hereinaftershown and described and then specifically pointed out in the claims.

A practical embodii'nent of the invention is represented in the accompanyingldrawings-forn'iing a part of this specification, in

which simllar characters of i reference; indicate corresponding parts in all the views. Figure 1 is a. sectional side elevation of the valveless syringe with the nozzle end-of the barrel shown in elevation andwith the liquid drawn into the barrel; 1 i Fig. 2 is a sectional side. elevation ofthe same with thenozzle pointing upward;

Fig. 3 is an enlarged sectional plan view of the same onthe line 33 of Fig. 2; and

Fig. 4: is an enlarged sectional elevation of the diaphragmshowing the positions assumed by the latter on using the syringe. The 'barrel 100f the syringe-is preferably made of glass and is provided at one end with a nozzle 11 and at the other end with a flaring mouth 12, and a rubber bulb 13 is used at this end of the barrel 10 and is provided with a neck 14 fitting snugly into the barrel and on to the flaring mouth 12, as plainly illustrated in Figs. 1 and 2. The neck 14 of the bulb 13 is provided with a :16 the weight of large opening 15 normally closed by a diaphragm lomadeof soft rubber or other suitable resilient material. The margin of the diaphragm 16 is vulcanized or otherwise attached to the edge of the neck 11 to practically form an, integral part thereof. The diaphragm 16 is provided with, at least, one puncture, rupture or break 17, but, as shown in the drawings, a number-of such punctures, ruptures or breaks are preferably formed in the diaphragm near the margin thereof but in register with the opening 15.

Normally the diaphragm 16 extends flat across the end of the neck 14: with the punctures, ruptures or breaks closed by the re siliency of the rubber of which the diaphragn'i is made. On using the syringe the operator first squeezes the rubber bulb 13 to compress the air contained in the bulb and thereby cause the compressed air to bulge the diaphragm 16 outward into the position shown at 16 in Fig. 1 whereby the diaphragm is expanded and hence the punc tures, ruptures or breaks 17, are opened to allow the air to pass into the barrel 10. The nozzle 11 is then immersed in a liquid after which the operator releases the bulb 13 to draw the liquid into the barrel 10 and to cause the diaphragm 16 to contract from the outwardly bulged and expanded-position to normal position thereby closing the punctures, ruptures or breaks and then to move into inward bulging and expanded position, as indicated at 16 in Fig. 1, to permit the air in the barrel to pass into the bulb 13 to reinfiate the latter. 7 When this has been done the diaphragm 16 by its resiliency returns to itsnormal flat contracted position whereby the punctures, ruptures or breaks 17 areagain closed by the resiliency of the rubber of which the diaphragm is made. The operator can now turn the syringe upside down or into any inclined position without danger of-the liquid flowing from the barrel into the bulb 13 as the neck 14 thereof is closed by the diaphragm l6. 1 y a By arranging the punctures, ruptures or breaks 17 near the margin of the diaphragm the column of liquid resting on the diaphragm is not liable to open the punctures, ruptures or breaks and the column of liquid is partly sustained by the capillary attraction of the tube and partly by the diaphragm itself. The diaphragm is sufficiently strong to prevent the column of liquid from flexing it to such a degree as to open the punctures 17 and hence no liquid is liable to pass into the bulb 13 when holding the barrel in upside down position, that is, with the nozzle upward as shown in when it is desired to eject the liquid from the barrel 1 0 to the aillicted part then the operator squeezes the bulb 13 to compress the air therein. The compressed air acts on the diaphragm 1G to bulge the same outward and thereby open the pl'lnct-ures, ruptures or breaks 17 as previously explained to allow the air under pressure to pass through the open punctures, ruptures or breaks 1'? into the barrel to eject the liquid therefrom to the alilicted part. As soon as the bulb 13 is relieved of pressure the diaphragm 16 immediately returns to normal flat position to prevent any liquid that may remain in the barrel from passing into the bulb on holding the syringe upside down. Thus from the foregoing it will be seen that normally the barrel is disconnected from the interior of the bulb 13 and only on alternately pressing and releasing the bulb 18 communication is had between the interior of the bulb and the barrel for the exit and entrance of air as above explained.

It is expressly understood that the puncture, rupture or break in the diaphragm is diminutive and in making it none of the material of the diaphragm is removed and hence the resilient nature of the material readily closes the puncture and: keeps the same closed as long as the diaphragm re mains in the normal flat position. The'puncture,;1upture or break is preferably made by piercing the rubber diaphragm with a suitable, sharply pointed instrument.

It is understood that in syringes having a rubber bulb, it 'is desirable that the med=icated or other liquid [does not pass into the bulb to avoid tletenioration of the bulb by the influenceo'fjthe medicated liquid. By preventing the liquid from passing into the bulb the user of the syringe 'can 'at all times see whether the medicated liquid contained in the barrel is in proper 'condition *or not. The improvement is shown applied "to syringe barrels but it may be applied j t'o the suction bulb "of E1 l)1GflSt pump or similar apparatus "to prevent the milk drawn from the breast to pass into the bulb. 1ft will also be noticed that by the use of the bulb with a punctured iliaphragm in a -hreast Copies of this patent may be obtained for at; eents each, by :addrssing'1 the Washington, FD- .C.

pump, the suction action is retarded and hence the milk is slowly drawn from the breast thus preventing undue pain,

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A syringe, comprising a barrel provided at one end with a discharge nozzle, a compressible bulb having a neck fitting the other end of the said barrel and. adiaphragm of resilient material, the said diaphragm located between the liquid-receiving portion of the barrel :and the bulb, the :diaphragm being provided with at least one puncture n'oianally closed by the action of the resilient material of which the diaphragm is made, the diaphragm expanding on application of pressure on either side of the .diaphra' m to open the puncture :toallow air to pass rem the bulb into the barrel or vice versa the diaphragm-en the release of pressure returning to normal contracted position thereby elosi-ng the puncture.

2. A valveless syringe, comprising a barrel provided atone end with ardischarge noz- .z le and at the ot er end with a flaring mouth, a compressible bulb having a neck fitting within the said flaming mouth and "a diaphragm secured to the said neck and formed of resilient material, the diaphragm having at least one diminutive pimcture norm ally closed-by the :action (of the mauemmaterial-of which the diaphragm is made, the diaphragm on pressing the bulb and compressing the :air causing the latter to bulge the diaphragm out .ard'ly 'and there'by expending the diaphragm and opening the puncture to allow escape of the air contained in the Ibulb into the barrel; the diaphragm on relieving the pressureon "the bulb with the nozzlein-serted in: a liquid returning first to normal contracted position to close the :pun'ct .e andthnsbhlging inward to again ropen the .punctureto draw the liquid into the'barrel andttoiall'ow thefair in the :l'atterwto pass way of the open puncture into the bui'b to :reinflate the :latter, the diaphragm after rizein'fla'tion of the bulb returning to noIim-alfflait lpo'siti'on. thereby closing :the puncture to prevent the "liquid from passing :into the bulb onshdleling the syringe with the nozzle upward and with the 'liquid'resting on the-diaphragm; 1

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